Seat and back rest for a chair



FIG. 1 is a perspective view showing the top, left side and front of a seat and back rest for a chair which form my new design, the broken lines in this and other figures showing other parts of the chair being for illustrative purposes only and forming no part of my design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a front elevational view thereof. 

The ornamental design for a seat and back rest for a chair, as shown and described. 